You can do so much in comments.
Prove that you have read what the poster has taken the time to write, and make a personal connection.
For instance, in this post @cryptoctopus talked about starting projects. So you might ask what projects they have been involved in personally. Although the OP does talk about some projects to check out, they don't note if they are personally involved in it.
If you can start a conversation in the comments, then maybe the original poster will be interested in checking out your blog and see what you are writing about. Then maybe you get some big upvotes from them.
bingo